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Chapter 7: Q.25 (page 429)

What is P(危x>290) ?

Short Answer

Expert verified

The value ofP(危x>290)=0.9772.

Step by step solution

01

Given Information

An unknown distribution has a mean 12 and a standard deviation of one. A sample size of 25 is taken.

02

Explanation

Let's use Ti- 83 calculator to compute the probability.

For that, Click on 2nd. Then, DISTR, and scroll down to the normalcdf option. Enter the provided details. After this, click on enter button to get the result:

Hence, the value of P(危X>290)is :

=1鈭�0.022750

=0.97725

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Most popular questions from this chapter

46. Draw the graph from Exercise 7.45

Use the following information to answer the next six exercises: Yoonie is a personnel manager in a large corporation. Each month she must review 16 of the employees. From past experience, she has found that the reviews take her approximately four hours each to do with a population standard deviation of 1.2hours. Let Xbe the random variable representing the time it takes her to complete one review. Assume Xis normally distributed. Let Xbe the random variable representing the mean time to complete the 16 reviews. Assume that the 16 reviews represent a random set of reviews.

1. What is the mean, standard deviation, and sample size?

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